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THE CAMBRIDGE UNIVERSITY CALENDAR for the YEAR 1906-1907. With Corrections and Additions to the end of September, 1906.

New Regulations for the Previous Examination (Arabic, Sanskrit, Chinese), Special Examination in Mathematics, Moral Sciences Tripos, Mechanical Sciences Tripos, Tropical Medicine and Hygiene, Foreign Service Students, Agricultural Sciences, Forestry. Geographical Studies, Military Studies, Mining Engineering.

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JUST PUBLISHED. With Frontispiece Portrait of Dr. G. Johnstone Stoney, and Diagrams in the Text. Crown 8vo. 5s. net.

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NEW VOLUME IN "THE WAYSIDE AND WOODLAND SERIES." In pocket size, 6 by 4 in., cloth gilt, round corners, price 68. ner, post free 6s. 4d.; also in blue velvet calf, gilt edges, boxed (Price on Application)

THE ELECTRON THEORY: THE BUTTERFLIES

A Popular Introduction to the New Theory of Electricity and Magnetism.

By E. E. FOURNIER,

B Sc. (Lond.), A.R.C.Sc., Compiler of Contemporary Electrical Science. WITH A PREFACE BY

G. JOHNSTONE STONEY, M.A., D.Sc., F.R.S. LONCMANS, CREEN & CO., 39 Paternoster Row, London, E.C.

If you wish to interest your friend in the sublime Science of Astronomy, you should present him or her with a copy of the book entitled :

A POPULAR INTRODUCTION TO ASTRONOMY

By Rev. A. C. HENDERSON, B.D., F.R.A.S.
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Tastefully bound in Sky-blue Cloth with Silver Lettering.

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"Notes on Overhead Equipment of Tramways" (with discussion), y R. N. TWEEDY and H. DUDGEON, Birmingham Local Section; " Econom Considerations in the Employment of Storage Batteries" (with discussion. by J. R. SALTER, Manchester Local Section; "Litts and Hoists" (with discussion), by H. C. CREWS; "The Testing of Transformers and Tran former Iron" (with discussion), by Dr. D. K. MORRIS and G. A. LISTRI Birmingham Local Section; "A Simple Method of Measuring Sparking Voltages" (with discussion), by E. A. Watson, Birmingham Local Section "Steam Turbine Dynamos," by A. G. ELLIS; "Some Notes on Singphase Railway Working," by H. W. TAYLOR; "The Efficiency of Lang Globes," by J. S. WESTERDALE, B.Sc., and F. C. PRENTICE, B.SC "Notes on Electrical Conductivity," by W. BROWNING; Education and Training of Engineers," Report of Committee of Institution of Cind Engineers. Messrs. E. & F. N. SPON, Ltd., 57 Haymarket, London, S.W.

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Please write for information regarding latest Educational Publications to

BLACKIE & SON, Ltd.,

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RADIO-ACTIVE

TRANSFORMATIONS.

By PROFESSOR Ernest RUTHERFORD, Professor of Physics at the McGill University, Montreal, Canada. Crown 8vo. 16s. net.

Professor Rutherford's investigations into the properties of radio-active matter and his many discoveries have placed him in the front rank among the world's physicists. This book embodies the results of his researches in the field of radio-active bodies, where he has long been recognised as a leader among modern scientists. His book opens with an historical review of the more important properties exhibited by the radio-active bodies, and then passes to an explanation of the "disintegration theory," which has been found to account for the processes occurring in all radio-active bodies. Under this view the radio-active substances are undergoing spontaneous transformation with the appearance of new kinds of matter, which are unstable and have a limited life. The radiations accompany the tran-formations and are produced as the result of an explosive disturbance within the atom. The application of this theory in unravelling the complicated series of transformations in radium, thorium, and actinium forms the main subject of Professor Rutherford's work.

LIQUID AIR and THE LIQUEFACTION TIME AND CLOCKS ;

OF GASES. By T. O'CONOR SLOANE, A.M., E.M.,
Ph.D. Second Edition, many Illustrations.

10s. 6d. net. Physics. Heat. Heat and Gases. Physics and Chemistry of Air. The Royal Institution of England. Michael Faraday. Early Experimentors and their Methods. Raoul Pictet. Louis Paul Cailletet. Sigmund von Wroblewski and Karl Olszewski. James Dewar. Chas. E. Tripler. The Joule-Thompson Effect. The Linde Apparatus. The Hampson Apparatus. Experiments with Liquid Air. Some of the Applications of Low Temper.

ature.

PRINCIPLES

A Description of Ancient and Modern Methods of Measur ing Time. By H. H. CUNYNGHAME, C.B. With numerous Illustrations. Crown 8vo. 65. net.

By the aid of many practical and pertinent illustrations the author makes clear the methods employed in all ages for measuring and indicating time. The principle of the sundial, the water clock, the portable sundial (forerunner of the watch), the grandfather's clock, and the chronometer are lucidly dealt with-as well as the various improvements that have resulted in the most modern forms of mechanism.

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Being an Introduction to Work with the Microscope. By SIR A. E. WRIGHT, M.D., F.R.S., D.Sc. Dublin (Honoris Causa), F.R.C.S.I. (Hon.). With many Illustrations and Coloured Plates. Imp. 8vo. 215. net.

LIST OF CONTENTS.

General Considerations with regard to the Object Picture. Development of the Object Picture in the case where Objects are disposed upon a Single Optical Plane. Development of the Object Picture in the case where the Elements, which are viewed by the Unaided Eye, or, as the case may be, by the Microscope, are piled one upon the other. On the principles which govern the Staining Operations which are undertaken for the purpose of developing a Microscopic Colour Picture. On the restrictions which hamper the Microscopist in the matter of the Selection and Development of the Stage-Picture; on the Defects and Sources of Fallacy which attach to the Microscopic Outline-Picture and Microscopic Colour-Picture respectively; and on the limitations which are imposed upon Microscopic achievement by the inadequate representation of the object in the Stage-Picture. Image Formation by the Simple Aperture. On Image Formation by the Lens-armed Aperture. On the defects which are introduced into the Image by Spherical and Chromatic Aberration in the Lens. On the Defects introduced into the Image by Diffraction occurring in the Aperture of the Lens. Image Formation in the case where the Object is viewed by the Unaided Eye. Image Formation in the case where an Object is viewed through a Simple Microscope. Image Formation in the case where the Object is viewed through the Compound Microscope. On the Optical Elements of the Microscope considered separately. On the Instrumental Adjustments required for the achievement of Dark Ground Illumination and Stereoscopic Illumination in particular in connection with Wideangled High-power Objectives. On the Adjustments required for the achievement of a Critical Image. On the Question as to whether there are Definite Limits imposed upon Microscopic Vision and Resolution; and on the Real Nature of the Limitations encountered in connection with the employment of High Magnifications.

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CHEMISTRY. By N. MONROE HOPKINS, Ph.D.,
Assistant Professor of Chemistry in The George Washington
University, Washington, DC. With 130 Illustrations.
Demy 8vo. 125. net.

Historical Notes and Important Classic Researches. The Theory of
Electrolytic Dissociation. Novel Experiments in "Electrolytic Induction."
"The Velocity of Electrolytic Conduction." Faraday's Law. Energy
required in Electrolysis. Important Conditions to be Noted in Electro-
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from Potassium Chloride. The Production of Nitric Acid from the
Atmosphere. The Isolation of the Metals Sodium and Potassium. The
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tric Furnace and Furnace Products. Preparation of Organic Compounds.
The Primary Cell. The Secondary Cell. Electricity from Carbon. Useful
Pieces of Apparatus. Bibliography Chronologically arranged.
A MANUAL OF THE TREES OF
NORTH AMERICA. By CHARLES S. SARGENT.
Illustrated from Drawings by C. E, FAXON. Demy 8vo.
255. net.

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ELECTRIC FURNACES.

By J. WRIGHT. 2nd Impression. With 57 Illustrations
Demy 8vo. 8s. 6d. net.

Introductory and General. Efficiency of the Electric Furnace. Arc
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Glass Manufacture in the Electric Furnace. Electrodes and Termina
Connections. Furnace Thermometry.

CHEMISTRY OF PAINTS and PAINT
VEHICLES. By C. H. HALL. 8. net.
AMERICAN INSECTS.

By Professor VERNON L. KELLOGG. With many
original Illustrations by MARY WELLMAN. Square
8vo. 215. net.

The chapters on insects and flowers, colour and pattern and their ass, insects and disease, are of great interest.

Nature." An admirable work on general entomology that cant-st fail to at once arrest the attention and rivet the interest of the merest tyre

LECTURES ON TROPICAL DISEASES. By Sir Patrick Manson, K.C.M.G., M.D., F. R.C. P., F. R.S., Medical Adviser to the Colonial Office. Fully Illustrated. Demy 8vo. 75. 61 net. THE SUBCONSCIOUS. A Study in Descriptive Psychology. By

Professor JASTROW. Extra Crown 8vo. 10s. 67. net.

The aim of the book is to give a clear exposition of the nature and significance of the subconscious factors in every-day mental processes. LONDON: 16 JAMES STREET, HAYMARKET.

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BOTH DRAWN BY THE SAME STUDENT ON THE SAME DAY.

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INVAR The patented Alloy of Nickel Steel which has

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POPULAR STAR

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A Rapid and Easy Method of finding the Principal Stars.

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